Statistical Analysis of Chorus Wave Observation from the Van Allen Probes and Arase Spacecraft

Chorus waves play a key role in the dynamics of energetic electrons in Earth's radiation belts, making it essential to understand their spatial distribution. However, data from a single spacecraft mission are often insufficient to capture the spatial and temporal variability of chorus waves. This study focuses on the statistical analysis of chorus wave observations from two distinct satellite missions: the Van Allen Probes and Arase. While the Van Allen Probes are well-established and extensively utilized dataset of wave observations, their coverage is limited to 20 degrees magnetic latitude, whereas Arase extends beyond 40 degrees. Thus, investigating the statistical properties of chorus waves is important for developing techniques to combine these two sets of observations, providing a more comprehensive spatio-temporal dataset. We perform a comparative analysis of magnetic intensity of chorus waves from both satellite missions, aiming to understand their spatial and temporal characteristics during the overlapping mission period. Preliminary results indicate that the statistical features of chorus wave intensities observed by the Van Allen Probes and Arase agree in general. However, in time-averaged observations, the Van Allen Probes yield higher values than those of Arase. These findings will help develop chorus wave models by combining the observations from these two satellite missions.